package com.lee.small.product.service.impl;

import io.prometheus.client.Collector;
import org.springframework.stereotype.Service;

import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.lee.common.utils.PageUtils;
import com.lee.common.utils.Query;

import com.lee.small.product.dao.CategoryDao;
import com.lee.small.product.entity.CategoryEntity;
import com.lee.small.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //查出所有分类
        List<CategoryEntity> list = baseMapper.selectList(null);
        List<CategoryEntity> level1Menus = list.stream().filter(categoryEntity ->
             categoryEntity.getParentCid() == 0
        ).map(menu->{
            menu.setChildren(getChildren(menu,list));
            return menu;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());
        return level1Menus;
    }

    @Override
    public void removeMenuByids(List<Long> asList) {
        //TODO 1.检测当前删除的菜单，是否被别的地方引用
        baseMapper.deleteBatchIds(asList);
    }

    //查询子菜单
    private List<CategoryEntity> getChildren(  CategoryEntity root,List<CategoryEntity> level1Menus){
        return level1Menus.stream().filter(children->
            children.getParentCid() == root.getCatId()
        ).map(categoryEntity -> {
            categoryEntity.setChildren(getChildren(categoryEntity,level1Menus));
            return categoryEntity;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());
    }

}